Perri sat there, watching the Blood Elf and his summoned Voidwalker. The litter of corpses around the Elf's feet had little effect upon the Gnome, Perri had been watching the Horde Warlock for the better part of ten minutes, analysing, waiting.... knowing...
Why the Blood Elf didn't heed the stationary Gnome, no body knows. An initial pause was all that greeted Perri when he first stumbled on the Horde Warlock, and a continuing of whatever he was doing, as if the Gnome did not exist....